Avoid a misuse of a variable.
Format code. #mania
Support $this.

Create the sub-library `Hoa\Praspel\AssertionChecker` and introduce
$this support through “implicit variables”.
Cont'd.
Include visitors from Hoa\Realdom.
[auto] Merge from Praspel

    • #83a079c — Avoid a misuse of a variable. (Ivan Enderlin, 2013-11-04)
    • #88fb5a4 — Format code. #mania (Ivan Enderlin, 2013-11-04)
    • #750cdea — Support $this. (Ivan Enderlin, 2013-11-05)
    • #a6a72c4 — Cont'd. (Ivan Enderlin, 2013-11-05)
    • #2d4561d — Include visitors from Hoa\Realdom. (Ivan Enderlin, 2013-11-05)

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Merge remote branch 'library-praspel/master'